MS OAuth2 Error The API version ‘V2’ has been depreciated

Microsoft has been pushing developers to migrate from older Exchange Online APIs to Microsoft Graph API. If you’re still using the V2 version of the OAuth2 authentication for Microsoft services like Active Directory, you may need to update the API configuration to use Microsoft Graph.

Here’s a step-by-step troubleshooting guide and proposed solutions:

1. Check osTicket Version and OAuth Plugin Compatibility

Ensure that you are using the latest version of osTicket and the OAuth2 plugin. Microsoft might have deprecated the API used by older versions of the osTicket OAuth2 plugin, and newer versions may include support for the latest APIs.

Solution:

• Update osTicket: Check if there is a new version of osTicket that supports newer API versions or any patch related to Microsoft OAuth2.

Ensure that the OAuth2 plugin you are using in osTicket is the latest version that supports the current Microsoft API (usually Microsoft Graph API).

2. Switch to Microsoft Graph API

Microsoft has been pushing developers to migrate from older Exchange Online APIs to Microsoft Graph API. If you’re still using the V2 version of the OAuth2 authentication for Microsoft services, you may need to update the API configuration to use Microsoft Graph.

Solution:

• In osTicket, check your OAuth2 configuration. If it’s set to use the old version (V2), update the API settings to point to the Microsoft Graph API instead.

3. Update API Permissions in Microsoft Azure

Ensure that the required API permissions for Microsoft Graph API have been configured in Azure Active Directory.

Steps:

1. Log into Azure Portal: Go to Azure Portal
2. Navigate to Azure Active Directory.
3. App Registrations > Locate your OAuth application.
4. API Permissions > Ensure you’ve added and granted admin consent for the necessary Microsoft Graph API permissions (e.g., Mail.Read, Mail.Send, etc.).
5. Authentication: Ensure the redirect URI configured in Azure is correct and matches your osTicket setup.

4. Modify osTicket .htaccess Configuration

The initial .htaccess change you made might have resolved the “No input file specified” error, but now it’s essential to ensure that it’s correctly set up for handling OAuth2 requests.

Solution:

Double-check that your .htaccess file under the /api/ directory is set up properly. The redirect rule you changed (RewriteRule ^(.*)$ %1/http.php/$1 [R,L]) should be correct, but you may want to review if additional configurations are needed for OAuth2 endpoints.

5. Double-Check SMTP and OAuth Settings

Even though you mentioned that “Turn off SMTP AUTH protocol” is unchecked, double-check that: OAuth2 is enabled for SMTP and IMAP in your Office365 settings. Your osTicket’s email configuration should correctly uses OAuth2 for both incoming and outgoing email.

Steps:

• Go to the Office365 Admin Center and verify the settings under Settings > Org settings > Modern authentication.
• Ensure OAuth2 authentication is fully enabled.

6. Clear Cache / Use Private Mode

Since you’ve already tried logging into osTicket using Private/Incognito mode and it didn’t work, you might also try:

• Clearing all browser and system cache to ensure no stale tokens or settings are interfering with the OAuth authentication.

7. Check OAuth2 Logs in osTicket and Azure

Check both osTicket and Microsoft Azure logs to see if there are any additional details related to the authentication process that could provide clues.

Solution:

• In osTicket: Enable detailed logging and review the logs to gather more information.
• In Azure Portal: Under the App Registrations section, you can view sign-in logs and troubleshoot if anything is failing on the Microsoft side.

If all else fails, it’s possible that this is a known issue related to a deprecation of the V2 API that osTicket hasn’t fully resolved yet. Reach out to osTicket’s support team or community for further assistance.

Summary of Proposed Solutions:

1. Update osTicket and OAuth2 Plugin to the latest versions.
2. Switch to Microsoft Graph API in your osTicket OAuth configuration.
3. Update API Permissions in Azure to use the Microsoft Graph API.
4. Check and refine your .htaccess configuration to ensure OAuth2 requests are properly handled.
5. Verify that OAuth2 is enabled for SMTP and IMAP in Office365.
6. Clear cache or use private/incognito mode to avoid stale tokens.
7. Check OAuth logs in both osTicket and Azure for more information.
8. Contact osTicket support if the problem persists.

By following these steps, you should be able to resolve the deprecated API issue and restore Microsoft OAuth2 functionality in osTicket.